= (equal to)
Operators
< (less than)
Compares arguments for numerical inequality
(/= numstr [numstr] ...)
T, if no two successive arguments are the same in value; otherwise nil. If only one argument is supplied, /= returns T.
Note that the behavior of /= does not quite conform to other LISP dialects. The standard behavior is to return T if no two arguments in the list have the same value. In AutoLISP, /= returns T if no successive arguments have the same value; see the examples that follow.
(/= 10 20) returns T
(/= "you" "you") returns nil
(/= 5.43 5.44) returns T
(/= 10 20 10 20 20) returns nil
(/= 10 20 10 20) returns T
NoteIn the last example, although
there are two arguments in the list with the same value, they do
not follow one another; thus /= evaluates
to T.